JP3185811B2 - Sewage treatment facility - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewage treatment facility, and more particularly to a sewage treatment facility provided with a sewage treatment facility in rainy weather in a combined sewer with sewage and rainwater.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional sewage treatment facility of this type for purifying a combined sewer system 3 in which sewage 1 and rainwater 2 join together without a sewage treatment facility during rainy weather. . In such a sewage treatment facility, when rainwater 2 does not flow into the sewage system 3 and the amount of sewage does not increase as in fine weather, only the sewage 1 is sent to the first sewage basin 4 of the pump station. Then, the water is sent to the second sewage sedimentation basin 6 of the treatment plant by the first sewage pump 5 of the pumping station, and is first purified by the second sewage pump 7 through the sedimentation basin 8, the aeration tank 9, and the final sedimentation basin 10. After that, it is discharged into a public water area as treated water 11. The sludge initially generated in the settling basin 8 is withdrawn as the initial settled sludge 12, sent to the integrated sludge treatment facility 13, and disposed of.

However, in rainy weather, especially in heavy rain, sewage 1
At the same time, a large amount of rainwater 2 flows into the sewer 3, and the amount of water becomes more than can be sent as sewage 1 from the pump station to the treatment plant.
In such rainy sewage, the sewage flowing into the pumping station is divided into the first sewage basin 4 and the first stormwater basin 14 at the pumping station, and is shunted to the first sewage basin 4. Sewage is sent to the treatment plant by the first sewage pump 5. On the other hand, the sewage diverted to the first rainwater sedimentation basin 14 is discharged to the public water area as overflow water 16 by the first rainwater pump 15.

Further, when the amount of water sent from each pumping station to the treatment plant is equal to or greater than the amount that can be purified at the treatment plant, a second sewage sedimentation basin 6 and a second rainwater set at the treatment plant are provided. It is diverted to the sedimentation basin 17. Then, the sewage diverted to the second sewage sedimentation basin 6 is first sent to the sedimentation basin 8 by the second sewage pump 7, and is purified and sludge treated in the same manner as described above. On the other hand, the sewage diverted to the second rainwater sedimentation basin 17 is sent to the simple treatment pond 19 by the second rainwater pump 18, subjected to simple purification treatment, and then discharged to the public water area as the discharge water 19. Further, the sludge generated in the simple treatment pond 19 is sent to the sludge integrated treatment facility 13 and disposed of.

[0005] As described above, in a sewage treatment facility that does not have a facility for dealing with sewage during rainy weather, some sewage is discharged without purification treatment. For this reason, there is a sewage treatment facility in which a pump station or a treatment plant is provided with a sewage treatment facility in rainy weather so as to be able to cope with rainy weather. Sewage treatment equipment 21, 2
8, sludge treatment facilities 24 and 31 are provided. That is, the sewage in rainy weather that flows into the pumping station is divided into the first sewage basin 4 and the first stormwater basin 14 of the pumping station. Then, the sewage diverted to the first sewage sedimentation basin 4 is sent to the treatment plant by the first sewage pump 5. On the other hand, the sewage diverted to the first rainwater sedimentation basin 14 is sent to the first rainy-day sewage treatment equipment 21 by the first rainwater pump 15, purified, and then discharged as treated water 22. Further, the sludge 23 generated in the first rainy-day sewage treatment facility 21 is sent to the first sludge treatment facility 24 to be dewatered, and is dehydrated as a dewatered sludge by a truck or the like.
The wastewater is transported and disposed of in
Is returned to.

Further, when the amount of sewage sent from each pump station to the treatment plant is larger than the capacity of the treatment plant to purify the sewage, the second sewage sedimentation basin 6 and the second sewage basin 6 provided in the treatment plant are provided.
And the rainwater settling basin 17. Then, the sewage diverted to the second sewage sedimentation basin 6 is subjected to purification treatment and sludge treatment in the same manner as described above. On the other hand, the sewage diverted to the second rainwater sedimentation basin 17 is sent to the second rainy-day sewage treatment equipment 28, purified, and then discharged as treated water 29. Also, the second
The sludge 30 generated in the sewage treatment facility 28 during rainy weather is sent to the second sludge treatment facility 31 to be dewatered and dewatered, and the dewatered sludge 32
The dewatered filtrate 33 is returned to the sewer 34 while being transported to the sludge integrated treatment equipment 13 for disposal.

[0007]

However, conventional sewage treatment facilities equipped with facilities that can cope with rainy weather also include sludge treatment facilities 24 and 31 in sewage treatment facilities 21 and 28 in rainy weather.
However, there are the following disadvantages. (1) The installation area of the sludge treatment facilities 24 and 31 attached to the sewage treatment facilities 21 and 28 during rainy weather is the sewage treatment facility 2 during rainy weather.
It requires about twice the area of the installation area of 1,28. Many of the combined sewers are used in urban areas,
Sludge treatment facilities 24, 3 in sewage treatment facilities 21, 28 in rainy weather
There is a problem in terms of securing land, and there is a need for a sewage treatment facility that does not need to be provided with sludge treatment facilities 24 and 31 that require a particularly large installation area. (2) Since the dewatered sludge 25 of the sludge treatment facilities 24 and 31 is transported by a truck or the like, there is a problem that the sludge storage capacity of the sludge treatment facilities 24 and 31 is insufficient when rainfall continues for a long time. For this reason, it is conceivable to provide a sludge pipe from the sludge treatment facilities 24 and 31 to the sludge general treatment facility 13. However, since the pipe is a long-distance pipe and only uses the sludge pipe in rainy weather, the clogging of the sludge in the pipe is possible. It is not realistic because troubles such as are likely to occur.

The present invention has been made in view of such circumstances, and it is not necessary to add a sludge treatment facility to a sewage treatment facility for rainy weather installed in a pump station or a treatment plant, and the sewage treatment facility for rainy weather is not required. It is an object of the present invention to provide a sewage treatment facility capable of easily treating sludge.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a pumping station into which a combined sewage of sewage and rainwater flows, and a treatment plant for purifying sewage sent from the pumping station. When the amount of sewage flowing into the pumping station is a normal amount of water, all the sewage is sent from the pumping station to the treatment plant to perform purification treatment, and the sludge is drawn out as the first settling sludge in the first settling pond of the treatment plant. In a sewage treatment facility that performs sludge treatment and separates and separates sewage to be sent to the treatment plant at the pumping station and sewage to be sent to the sewage treatment facility in rainy weather at the pumping station at the time of abnormally increased water amount, The sludge generated in the sewage treatment facility at rainy weather of the pumping station is carried into the inlet of the first sewage pump for sending sewage from the pumping station to the treating station, or the sewage to be sent from the pumping station to the treating station. Flowing Carried into sewer, characterized in that a first sludge pipe

[0010]

According to the present invention, the sludge generated in the sewage treatment facility at the time of rain in a pumping station is carried in by providing a carrying-in means for carrying in the sewage to be sent from the pumping station to the treatment station. In addition, the sludge carried into the sewage to be sent to the treatment plant is first drawn out and disposed of in the sedimentation basin as the first settling sludge, and thus does not adversely affect the purification treatment of the sewage treatment facility of the present invention. Accordingly, it is not necessary to add a sludge treatment facility to the sewage treatment facility in rainy weather of the pump station unlike a conventional sewage treatment facility.

In addition, the sludge generated in the sewage treatment facility at the time of rainy weather at the pumping station of the treatment plant is provided with a carrying-in means for carrying the sewage which is first sent from the pumping station to the sedimentation basin. Also,
The sludge carried into the sewage first sent to the sedimentation basin is drawn out and disposed of as the first sedimentation sludge of the first sedimentation basin, and thus does not adversely affect the purification treatment of the sewage treatment facility of the present invention. Thus, it is not necessary to add a sludge treatment facility to the sewage treatment facility in rainy weather of the treatment plant unlike the conventional sewage treatment facility.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a sewage treatment plant according to the present invention will be described below in detail with reference to the accompanying drawings. As shown in FIG. 1, the sewage treatment plant of the present invention includes three pumping stations,
And a treatment plant for purifying sewage from each of the pump stations. Each of the pump stations has a first sewage basin 40, a first sewage pump 42, and a first stormwater basin 4.
4 and the first rainwater pump 46 are disposed in parallel,
The sewage from the combined sewer 52 where the water and the rainwater 50 merge is appropriately divided into the first sewage sedimentation basin 40 and the first rainwater sedimentation basin 44. In addition, the first sewage pump 42 sends the sewage flowing into the first sewage sedimentation basin 40 to a treatment plant via a sewer 52. Further, the first rainwater pump 46 is connected to a first rainy-day sewage treatment facility 54 by a pipe 56, and the sewage flowing into the first rain-water sedimentation basin 44 is sent to the first rainy-day sewage treatment facility 54. Send water.
In addition, the first rainy sewage treatment equipment 54
A first sludge pipe 58 is connected to the inlet of the sewage pump 42 of the first embodiment, and the sludge generated in the first rainy sewage treatment equipment 54 is sent from each pumping station to the treatment plant via the first sludge pipe 58. To be brought into the sewage.

On the other hand, the treatment plant includes a second sewage basin 60 and a second sewage pump 62 and a second stormwater basin 64 and a second sewage basin 64.
Are disposed in parallel, and sewage sent from each pumping station is appropriately divided into a second sewage sedimentation basin 60 and a second rainwater sedimentation basin 64. The second sewage pump 62 is connected to a second sewage sedimentation basin 60 by a pipe 70, and the second rainwater pump 66 is connected to a second rainy sewage treatment facility 72 by a pipe 74. Also, a second sludge pipe 76 is connected from the second rainy sewage treatment equipment 72 to the entrance of the first sedimentation basin 68, and the sludge generated in the second rainy sewage treatment equipment 72 is the second sludge sewage treatment equipment 72. The sludge is supplied from the second sewage sand basin 60 to the sewage which is first sent to the sedimentation basin 68 via the sludge pipe 76. Also, from the second sewage sedimentation basin 60 to the first sedimentation basin 68
The sewage sent to the water is purified through an aeration tank 78 and a final sedimentation basin 80 and then discharged as treated water 82. Further, the sludge generated in the first settling basin 68 is sent to a general sludge treatment plant 86 as a first settled sludge via a pipe 84 and is disposed of.

Next, the operation of the thus constructed sewage treatment plant of the present invention will be described. In fine weather, that is, when only the sewage 48 flows into the combined sewer, all the sewage flowing into the pumping station from the sewer 52 flows into the first sewage sedimentation basin 40, and the second sewage pump 42 uses the first sewage pump 42. The water is sent to the sewage basin 60. And the second sewage sedimentation basin 60
The sewage sent to the basin is first subjected to a purification treatment through a sedimentation basin 68, an aeration tank 78, and a final sedimentation basin 80, and then discharged to a treated water 82. The sludge initially generated in the sedimentation basin 68 is sent to the integrated sludge treatment facility 86 via the pipe 84 as the initial sludge and is disposed of.

When a large amount of rainwater 50 flows into the sewer 52 together with the sewage 48 due to heavy rain, particularly in heavy rain, the sewage flowing into each pump station is divided into a first sewage basin 40 and a first stormwater basin 44. You. The sewage flowing into the first sewage sedimentation basin 40 is sent to the treatment plant by the first sewage pump 42. The sewage flowing into the first storm sedimentation basin 44 is
Rainwater pump 46, the first rainy sewage treatment facility 54
And the water is purified and then discharged as treated water 55. The sludge generated in the first rainy sewage treatment equipment 54 is supplied to the first sewage pump 4 via the first sludge pipe 58.
2 is carried into the entrance. First Rainy Sewage Treatment Equipment 54
The sewage carrying the sludge generated in the above is sent to the treatment plant by the first sewage pump 42 via the pipe 52, and is separated into the second sewage sedimentation basin 60 and the second rainwater sedimentation basin 64. . Then, the sewage diverted to the second sewage sedimentation basin 60 is first sent to the sedimentation basin 68 via the pipe 70 by the second sewage pump 62, and is subjected to purification treatment and sludge treatment in the same manner as described above. On the other hand, the sewage diverted to the second stormwater sedimentation basin 64 is sent to the second rainy-time sewage treatment equipment 72 via the pipe 74 by the second stormwater pump, and is subjected to the purification treatment.
Released as 5. The sludge generated in the second rainy-day sewage treatment facility is first carried into the sedimentation basin 68 via the second sludge pipe 76. The sludge initially carried into the sedimentation basin 68 is withdrawn as the initial sludge, sent to the general sludge treatment facility 86 via the pipe 84, and disposed of.

As described above, according to the sewage treatment facility of the present invention, the sludge generated in the first rainy-time sewage treatment facility 54 of the pump station is supplied to the inlet of the first sewage pump 42 through the first sludge pipe 58. Carry in. In addition, the first sewage pump 4
The sludge carried into the inlet 2 is first extracted as the first settled sludge in the sedimentation basin 68, and therefore does not adversely affect the purification treatment of the sewage treatment facility of the present invention. As a result, the sewage treatment facility 54 at the time of rainy weather in
There is no need to add sludge treatment equipment to the plant.

Also, the pumping station of the treatment plant (ie, the second soil)
Water basin 60, second sewage pump 62 and second stormwater sink
The sand ponds 64 and the second rainwater pump 66)
The sludge generated in the sewage treatment equipment 72 during rainy weather is first carried into the sedimentation basin 68. Further, the sludge carried into the first sedimentation basin 68 is drawn out as the first sedimentation sludge of the first sedimentation basin 68, and thus does not adversely affect the purification treatment of the sewage treatment facility of the present invention. Thus, it is not necessary to add a sludge treatment facility to the sewage treatment facility 72 at the time of rainy weather in the pump station unlike a conventional sewage treatment facility.

In this embodiment, the sludge generated in the first sewage treatment facility in rainy weather is carried into the inlet of the first sewage pump. However, the present invention is not limited to this. It may be sent to the mud. In addition, the sludge generated in the second rainy-day sewage treatment equipment is first carried into the sedimentation basin, but is not limited thereto, and may be carried into the inlet of the second sewage pump. In addition, although the settling basin, the aeration tank, and the final settling basin were initially used as the purification process in the treatment plant, the present invention is not limited to this, and other purification equipment may be added or may be omitted. Further, initially, the sedimentation basin is not limited to the gravity type sedimentation, but may be a treatment by centrifugation, magnetic separation, or filtration separation.

[0019]

As described above, according to the sewage treatment apparatus according to the present invention, the carrying-in means for carrying the sludge generated in the sewage treatment equipment at the pumping station in rainy weather to the sewage for sending water from the pumping station to the treating station. And carry it in. In addition, the sludge carried into the sewage to be sent to the treatment plant is first drawn out and disposed of in the sedimentation basin as the first settling sludge, and thus does not adversely affect the purification treatment of the sewage treatment facility of the present invention. This allows
Unlike a conventional sewage treatment facility, it is not necessary to add a sludge treatment facility to a sewage treatment facility in rainy weather at a pumping station.

Further, the sludge generated in the sewage treatment facility at the time of rainy weather at the pumping station of the treatment plant is provided by a carrying means for carrying the sewage which is first sent from the pumping station to the sedimentation basin. Also,
The sludge carried into the sewage first sent to the sedimentation basin is drawn out and disposed of as the first sedimentation sludge of the first sedimentation basin, and thus does not adversely affect the purification treatment of the sewage treatment facility of the present invention. Thus, it is not necessary to add a sludge treatment facility to the sewage treatment facility in rainy weather of the treatment plant unlike the conventional sewage treatment facility.

Therefore, in the sewage treatment facility of the present invention, it is not necessary to add a sludge treatment facility to the sewage treatment facility in rainy weather. The installation area can be greatly reduced as compared with a sewage treatment facility equipped with a sewage treatment facility. Further, the present invention can be applied to an existing sewage treatment apparatus having no installation area for constructing both a sewage treatment facility for rainy weather and a sludge treatment facility.

[Brief description of the drawings]

FIG. 1 is a process diagram of a sewage treatment plant according to the present invention.

FIG. 2 is a process diagram of a conventional sewage treatment facility without a sewage treatment facility in rainy weather.

FIG. 3 is a process diagram of a sewage treatment facility equipped with a conventional sewage treatment facility during rainy weather.

[Explanation of symbols]

 48 sewage 50 rainwater 68 first sedimentation basin 72 sewage treatment facility in rainy weather 76 ... transportation means

Continuing on the front page (72) Inventor Yasushi Funakoshi 2-8-1 Nishishinjuku, Shinjuku-ku, Tokyo Inside the Tokyo Sewerage Bureau (72) Inventor Kiyoshi Miyajima 2-8-1 Nishishinjuku, Shinjuku-ku, Tokyo Tokyo Sewerage (72) Inventor Hirofumi Yamamoto 1-1-1 Uchikanda, Chiyoda-ku, Tokyo Hitachi Plant Construction Co., Ltd. (72) Inventor Masayuki Kojima 1-11-1 Uchikanda, Chiyoda-ku, Tokyo Hitachi Inside Plant Construction Co., Ltd. (72) Inventor Hitoshi Kawajiri 1-1-1 Uchikanda, Chiyoda-ku, Tokyo Hitachi Plant Construction Co., Ltd. (58) Field surveyed (Int. Cl. ⁷ , DB name) C02F 1 / 00 C02F 11/00 C02F 3/00

Claims (2)

(57) [Claims] 1. A pumping station, into which combined sewage of sewage and rainwater flows, and a treatment plant, which purifies sewage sent from the pumping station, wherein the amount of sewage flowing into the pumping station is a normal amount of water. Sometimes, all the sewage is sent from the pumping station to the treatment plant for purification treatment, and at the first settling basin of the treatment plant, sludge is drawn out as primary sludge for sludge treatment. It was diverted to the sewage water to wet-weather sewage treatment facilities of sewage and pumping stations for water supply at the respective purification treatment to sewage treatment facilities, the sludge generated in the rain during the sewage treatment facilities of the pumping station to,
A first sewage pumping sewage from the pumping station to the treatment station;
Carry in the inlet of the water pump or from the pumping station
The first is carried into the sewer where the sewage that feeds the treatment plant flows.
A sewage treatment facility characterized by sludge piping . 2. A pumping station, into which a combined sewage of sewage and rainwater flows, and a treatment plant for purifying sewage sent from the pumping plant. When the amount of sewage to be sent is normal, all sewage is sent to the first sedimentation basin of the treatment plant for purification, and sludge is drawn out as the first settled sludge at the first sedimentation basin of the treatment plant for sludge treatment. In a sewage treatment facility that separates and separates sewage to be sent to the first sedimentation basin and sewage to be sent to the sewage treatment facility in rainy weather at the pumping station at the pumping station, the sludge generated in the rain during the sewage treatment facilities, before
Carry in the first settling basin or drain the sewage into the first settling basin.
The second sewage carried into the inlet of the second sewage pump for water supply
A sewage treatment facility characterized by providing mud piping .